In-Vehicle Control Device and Manufacturing Method

Abstract

In an in-vehicle control device (1) including a base (10), a cover (20) fixed to the base, a circuit board (30) accommodated in the base and the cover, and an electronic component (40) mounted on the circuit board, at least one of the base or the cover is an integrated structure of a plurality of heat dissipation fins (15) and a main body (14), the plurality of heat dissipation fins being made of a portion of one steel plate as a material, and the main body being made of the remaining portion of the steel plate.

1 . An in-vehicle control device comprising:
 a base;   a cover fixed to the base;   a circuit board accommodated in the base and the cover; and   an electronic component mounted on the circuit board,   wherein at least one of the base or the cover is an integrated structure of a plurality of heat dissipation fins and a main body, the plurality of heat dissipation fins being made of a portion of one steel plate as a material, and the main body being made of a remaining portion of the steel plate.   
     
     
         2 . The in-vehicle control device according to  claim 1 , wherein each of the plurality of heat dissipation fins has the same thickness at a root portion close to the main body and at a distal end portion far from the main body. 
     
     
         3 . The in-vehicle control device according to  claim 1 , wherein in the main body, an installation region for the plurality of heat dissipation fins is thinner than a non-installation region for the plurality of heat dissipation fins. 
     
     
         4 . The in-vehicle control device according to  claim 1 , wherein
 the main body has a recessed portion recessed by a predetermined step size and formed in a surface of the main body, and   the plurality of heat dissipation fins are erected in the recessed portion.   
     
     
         5 . The in-vehicle control device according to  claim 4 , wherein a relationship indicated by t×(H−s)=d×s is established, in which t represents a thickness of the heat dissipation fin, d represents an inter-surface distance between two adjacent heat dissipation fins, H represents a height of the heat dissipation fin, and s represents the step size. 
     
     
         6 . The in-vehicle control device according to  claim 1 , wherein the steel plate is an aluminum plate. 
     
     
         7 . The in-vehicle control device according to  claim 1 , wherein a total surface area of the plurality of heat dissipation fins is eight times or more an area of an installation region for the plurality of heat dissipation fins in plan view of the main body. 
     
     
         8 . The in-vehicle control device according to  claim 1 , wherein the plurality of heat dissipation fins are portions formed by slicing and raising a surface layer of the steel plate. 
     
     
         9 . The in-vehicle control device according to  claim 1 , wherein at least one of the base or the cover on which the plurality of heat dissipation fins are provided is formed by skiving a surface of the steel plate, or press-molding the steel plate and then skiving the surface of the steel plate to form the plurality of heat dissipation fins. 
     
     
         10 . The in-vehicle control device according to  claim 1 , further comprising a flange for attachment to a structure of an automobile,
 wherein the plurality of heat dissipation fins are provided on the base, and   the plurality of heat dissipation fins are arranged in a space secured between the structure and the main body of the base by the flange.   
     
     
         11 . The in-vehicle control device according to  claim 10 , wherein the space is opened in a direction in which the plurality of heat dissipation fins extend along a surface of the main body. 
     
     
         12 . The in-vehicle control device according to  claim 1 , wherein a plurality of the heat dissipation fins are provided in each of a plurality of regions of at least one of the base or the cover, and at least one of a thickness, a height, a pitch, or the number of the plurality of heat dissipation fins is different for each region. 
     
     
         13 . The in-vehicle control device according to  claim 1 , wherein
 one of the base and the cover is an integrated structure of the plurality of heat dissipation fins and the main body made of the steel plate, and   the other of the base and the cover includes die-cast fins.   
     
     
         14 . The in-vehicle control device according to  claim 1 , wherein both the base and the cover are an integrated structure of the plurality of heat dissipation fins and the main body made of the steel plate. 
     
     
         15 . A manufacturing method of an in-vehicle control device including a base, a cover fixed to the base, a circuit board accommodated in the base and the cover, and an electronic component mounted on the circuit board, the manufacturing method comprising:
 slicing and raising a surface layer of a steel plate or a surface layer of a press-molded steel plate of at least one of the base or the cover to form a plurality of heat dissipation fins.